My J Conference 2014 presentation can be found at:
Slides only: http://www.jsoftware.com/papers/indexof/
Slides and script: http://www.jsoftware.com/papers/indexof/indexofscript.htm
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eval =: 1 : ' a: 1 : m'
A =: 1 : (,'u')
eval2ger =: 3 : 'a=. A for_i. y do. a=. (>i) eval a ` end. a'
a partial way of doing it,
(eval2ger@:((<' f.') ,~ each ]) 'increment';'result')@.choose f.
([: $: >:)`]@.(3 < |)
eval2ger takes a boxed list of string expressions, and turn
IIRC about 2 decades ago, the file extension for j scripts was "js" but
later java became popular and they used the same file extension. J had to
give in and changed to "ijs".
for debian version the first line is standardized to
#!/user/bin/ijconsole
Raul should have an alternate way that enable
This strikes me as a confusing name:
increment=: [: $: >:
because $: implies recursion. Also, the bounds of recursion get slippery
when you start rearranging the code (and using f.).
But let's take a step back and think about what you are asking for here:
You have defined:
increment =: [: $:
Note that the debian version of J uses ijconsole to avoid the conflict
with jconsole.
Thanks,
--
Raul
On Tue, Jul 29, 2014 at 4:10 PM, Ric Sherlock wrote:
> If you have java installed on your system then a program called jconsole is
> probably already in your path. I've taken to naming my symb
Taking a look at this, I'm not quite sure where you are going.
However, a few observations:
The first thing I notice when I try to read
at2=: 13 :'([:{:"1 *.) j./"1 y'
is that those parenthesis are not really necessary. We could instead go:
at2=: 13 :'{:"1 *. j./"1 y'
and let 13 : put in the
Suppose I have a recursive verb
([: $: >:)`]@.(3 < |)
And I want to name the components
increment =: [: $: >:
result =: ]
choose =: 3 < |
increment`result@.choose f.
3 : '[: $: >: y' :(4 : 'x [: $: >: y')`]@.(3 < |)
J carefully isolated recursion to the named verb
Thus I really
It should work as described, i.e. you should be able to do:
1. link jc to jconsole (as Ric suggests)
~$ ln -s /home/chris/j64-802/bin/jconsole jc
2. define t1.sh as:
#!/home/chris/jc
echo +/*:0".>,.2}.ARGV
exit''
3. make t1.sh executable:
~$ chmod +x t1.sh
4. call it:
~$ ./t1.sh 3 4
25
On
Thanks to both you and Chris. I am able to find jconsole through both path
and exporting the name "j" to start jconsole. Both work great, but getting
hashbang in the j script to take the name jconsole through the path is a
little tricky. Hashbang has some interesting restrictions. I had to change
t
If you have java installed on your system then a program called jconsole is
probably already in your path. I've taken to naming my symbolic link: jc
On Wed, Jul 30, 2014 at 7:36 AM, chris burke wrote:
> An alternative to renaming the J installation folder is to create a
> symbolic link to jcons
An alternative to renaming the J installation folder is to create a
symbolic link to jconsole, and reference that instead, e.g.
~$ ln -s j64-802/bin/jconsole
~$ ls -l jconsole
lrwxrwxrwx 1 chris chris 20 Jul 29 12:31 jconsole -> j64-802/bin/jconsole
Also, if you create the symbolic link on your p
It was not a problem getting around the minus sign problem. I simply
renamed the J directory from j64-802 to j64_802 and everything worked fine.
What concerned me was that the default name chosen for the 64 bit version
causes hashbang to fail. It is not much of a problem, probably not worth
fixing.
> Another question is how to find the link target in Linux. In windows ARGV
is set to the link target, where in Linux it is set to the name of the link.
In both cases, ARGV is defined as the call used to start J. If you want to
find jconsole, it should be in ~install/bin.
> Also, in the propertie
> Trying the example script in help/user/hashbang.htm and got the following
error:
This is explained in the second paragraph of that help page, i.e.
"The #! line will be run as a normal J sentence so it must run without
error or side effect. This is the case with #!/home/fred/j802/bin/jconsole,
b
Hi everybody!
Many thanks to the organizers, speakers and all the conference attendees for
making it happen! The conference was informative, inspiring, well organized and
even entertaining. It was nice to meet already familiar faces from 2012 and new
ones too.
I hope to see you next time!
Esa
Trying the example script in help/user/hashbang.htm and got the following
error:
don@ubuntu:~/j64-802-user/temp$ ./1.ijs
|domain error: script
| #!/home/don/j64-802/bin/jconsole
|[-0] /home/don/j64-802-user/temp/./1.ijs
Probably works fine for 32 bit version of J as the minus sign is not in
Hi Eric,
Thanks again for all the work that you and Liz put into delivering a top notch
event. I think that these conferences are really important, not only for the
presentations (which were diverse in content and well delivered), but for the
conversations that occur in the breaks between the p
As I am just heading for the airport after a delightful conference I seem
to have captured a way to analyze alternating series. What do you think
about this?
We stayed on the 7th floor of our hotel and had a great time.
f=:+/"1
f i."0 i.7
0 0 1 3 6 10 15
f i:"0 i.7
0
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